Milling wall

from Wikipedia, the free encyclopedia

The milling wall is a further development of the diaphragm wall . With the help of a milling head, the existing soil is mixed with cement paste or fiber cement paste. The existing soil is used as an aggregate for a concrete wall.

Milling head

In 2004 the company Bauer (Schrobenhausen) succeeded in changing the diaphragm wall and soil-mix process into a new process for wall production with a slightly modified diaphragm wall cutter. This creates the milling head, in which two cutting wheels (soil cutters) dig into the ground in opposite directions without using a supporting liquid as required for the diaphragm wall .

  • Milling head

  • Milling head at work

Making the wall

Manufacturing phases for the milling wall

When the milling head dips into the ground for the first time, a cement - bentonite mixture is added via a nozzle , which is intended to reduce the friction during milling. When the final depth is reached, the milling wheels are moved in the opposite direction and the milling head is slowly moved upwards. The existing soil is mixed with a cement paste or fiber cement paste so that a concrete wall is created in the subsurface.

This process is continued in the pilgrim step process as with the diaphragm wall , so that finally a closed wall made of concrete or fiber concrete is present in the subsoil.

Applications

The milling wall can be used well on subsoil with rolling components up to rock . Cohesive soils are currently not recommended as the finished concrete body cannot be guaranteed evenly.

  • anchored milling wall

  • stiffened milling wall

  • polygonal shaft with milled wall

The most important advantages of a milling wall compared to comparable systems are:

- high productivity compared to the diaphragm wall

- The existing floor can be used constructively

- low pollution (sustainable)

- completely vibration-free

- reduced noise

- Can be used in hard ground

- good quality control

- less nuisance

literature